In a nut: we're going to sell a ton of iPads.
iBooks 2.0 (or iBooks Textbooks) permalink
A new version of iBooks for iPad and iPhone/iPod touch. On the iPad there's added support for interactive elements such as video and pinching/zooming on photos and other media elements. iBooks Textbooks is only available for iPad. The iPhone/iOS iBooks app got an update but Textbooks aren't included on the smaller devices. Free download.
Previously iTunes U was only accessible via iTunes. Now available as a separate app for iPad and iPhone/iPod touch with a focus on helping teachers send out curriculum, syllabus, office hours, to-dos, etc. "Everything they need to do for a class." Obviously real world usage will dictate how well this actually works and you'll have to buy in (or convince your school's IT support nerd) to the Apple ecosystem to make it all work really well.
Read more about it at Macrumors.com or theverge.com.